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• im currently trying to concat multiple videos from a array of videos in state with react native ffmpeg but its showing no object or file

  20 août 2020, par Suraj Lalla

  I'm trying to concat videos from an array of videos in react native state using react-native ffmpeg,but the error is showing no file created, please help ,
im trying to add an array of objects containing the video uri

  


• Create a video preview image like youtube or whatsapp from a Video file (.mp4) using JAVA Code

  27 novembre 2017, par Ravi Dua

  Issue 1. When I use FFmpeg Java api, program doesn’t run and print anything after grabber.start(). No preview generated.

  Code Sample :

  public static boolean generatePreviewImage(String filePath, String previewFileName ) throws IOException {
  
          boolean isPreviewGenerated = false;
  
          System.out.println("Request received to generate thumbnail for video.");
  
          System.out.println("VideoFilePath : "+filePath);
  
          System.out.println("ResultFileName : "+previewFileName);
  
          try {
  
  
  
              FFmpegFrameGrabber fGrabber = new FFmpegFrameGrabber(filePath);
  
              System.out.println("FrameGrabber found "+fGrabber);
  
              fGrabber.start();
  
              System.out.println("Frame started..");
  
              ImageIO.write(fGrabber.grab().getBufferedImage(), "jpg", new File(previewFileName));
  
              System.out.println("Image written successfully as "+previewFileName);
  
              isPreviewGenerated = true;
  
              fGrabber.stop();
  
              System.out.println("FrameGrabber stopped.. "+fGrabber);
  
  
  
          } catch(Exception e){
  
              System.out.println("Exception while creating video thumbnail : "+previewFileName+" - exception - "+e);
  
              e.printStackTrace();
  
          }
  
          System.out.println("Image written successfully? "+previewFileName);
  
          return isPreviewGenerated;
  
      }   

  Result :
  Request received to generate thumbnail for video.
  VideoFilePath : /root/appdir/VIDEO20171124143855.mp4
  ResultFileName : /root/appdir/vdthumb_0.jpg
  FrameGrabber found org.bytedeco.javacv.FFmpegFrameGrabber@3529360e

  Nothing happens and gets printed after above statement..

  ---

  Additional Information :
  I installed FFmpeg on Linux VPS as well and able to generate preview using command line
  root@vps19984[ /usr/appdir]#ffmpeg -i /root/appdir/.VIDEO20171123165555.mp4 -r 1 -f image2 image-%2d.png
  (above command ffmpeg generates preview successfully on linux box but I want to generate it via Java program)

  ---

  Issue 2. When I use JCodec api, program generates a black image but NOT an image from video file.
  Code Sample :

  public static boolean generatePreviewImage(String filePath, String previewFileName ) throws IOException, JCodecException {
  
      logger.info("Request received to generate thumbnail for video. VideoFilePath : "+filePath+", resultFileName "+previewFileName);
  
      boolean isPreviewGenerated = false;
  
      Picture framePic = FrameGrab.getNativeFrame(new File(filePath),20);
  
      logger.info("Frame grabbed successfully..");
  
      Transform transform = ColorUtil.getTransform(framePic.getColor(), ColorSpace.RGB);
  
      Picture rgb = Picture.create(framePic.getWidth(), framePic.getHeight(), ColorSpace.RGB);
  
      transform.transform(framePic, rgb);
  
      logger.info("Frame transformed successfully to RGB..");
  
      BufferedImage dst = new BufferedImage(rgb.getCroppedWidth(), rgb.getCroppedHeight(),
  
              BufferedImage.TYPE_INT_RGB);
  
      ImageIO.write(dst, "jpg", new File(previewFileName));
  
      isPreviewGenerated = true;
  
      logger.info("Is preview generated.."+isPreviewGenerated);
  
  
  
  }

  Result :
  Request received to generate thumbnail for video. VideoFilePath : /usr/appdir/VIDEO20171123165555.mp4, resultFileName /usr/appdir/vdthumb_0.jpg
  Frame grabbed successfully..
  Frame transformed successfully to RGB..
  Is preview generated..true

  Issue : A black jpg image of 5 KB gets generated by JCodec

• Anomalie #4634 (En cours) : Supprimer la classe .album ?

  20 janvier 2021, par nicod _

  Dans /squelettes-dist/css/media.css on cible un classe .album et ses éléments, ce qui présuppose du style pour le plugin Albums, alors que je ne trouve pas de trace d’utilisation de .album dans les squelettes dist.

  Pourrait on supprimer ceci ?

  /* album */
  .album 
    margin-bottom : 1.5em ;
  
  .album ul 
    overflow : hidden ;
    margin : 0 ;
    list-style : none ;
  
  .album li 
    float : left ;
    margin : 0 ;
    margin : 0 10px 10px 0 ;
  
  .album .thumb 
    margin : 0 ;